In addition, nrITS is also suggested as a potential plant barcode.Limited by the universality and resolvability of single barcoding region, five combinations of these regions are proposed.

• 已有的研究表明以上任何一个单片段都不足以区分所有植物物种, 因而不同的研究组相继提出了不同的片段组合方案, 目前被广泛讨论的组合主要有5种。